Maxillary sinus lift is a procedure that arises from the need to increase the height of the maxilla because the patient’s maxillary bone is not high enough for the implant to be effectively buried and cemented in place. There are two main types, as follows: 1. Internal lift: it is a method that increases the height of the alveolar bone without making an additional incision, just at the implant socket, using the percussion method, or ultrasonic bone knife to grind away the bone at the floor of the maxillary sinus, so that the floor of the maxillary sinus is lifted and bone powder is implanted, which increases the height of the alveolar bone and makes the implant implantable length. 2. External lift: it is suitable for cases where the height of the maxillary bone is extremely insufficient, generally Less than 2mm, in this case, the maxillary sinus floor can be elevated by opening a window from the lateral wall of the maxillary sinus.